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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db1cae587efe2cceabda630dabf8ed3a122cf272f829efea63089fda5d46468b' 
  AND token = 'bSEEjcv8MxyHpxj2VxgmzeG+0Jc6A79+2NMRrP9ctu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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