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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '625d232836808d64859834dbd06b38024bb3d4667e2d9e9ca37d31d37792f791' 
  AND token = 'Q1t1ICf3VS3bXqyxyFad3N4qS8SQaSaVKgr5BiPVigk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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