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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3545b3f90f5424d256dffe6f1761a6b13790046fe934da844d115fece3012c9' 
  AND token = 'Diwv8/5tAnJaeWnstyx3gRJI3DR5ry8JEfeYRuecCCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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