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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ad4e5a74a83b4d8f871bacb4cebcf7c83fa8cb47c9c04107b3501375c4ab8e' 
  AND token = 'cjQelaF8eC0vo2n9rG19YDNPEaAhH5/gkobB5l2tHA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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