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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8c615f45475bf840e81234b947e889b0f2a1568016959971a90eb95bbfc3547' 
  AND token = 'bfC4Eo0c5n6Ib3cCasxRJaKX1LlcpJO3Ajo/QSIyGK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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