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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed2796fa21fd51f3fc39b459b98d919573c399b77bd61f99695032a96d1d53ca' 
  AND token = 'UimfWYR1DX9CMrZBCnvcsrXg0TZDMSuv3KNtTkDQ24s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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