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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '051a9e6e82f35016d1c2364585564c329b74b7a54fc505a70dbf9ca078d134aa' 
  AND token = 'DeDv1ZuaxuQPeQTIdOgH3g+IEcs3DD5GHMY7wadEIKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00161

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}