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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78dd4bb3331f12e303fff2fd25461fdebf688a6eb499cfbfe748c6a2d32569fe' 
  AND token = '5HV0CcbTwjCcWs3mHDhHj+enrDCaSB2524TP0k3jSYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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