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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11210f54d58890b57be9f9ace1e5d8900ad9448dfa149f1a296b4c2ea54100f4' 
  AND token = 'yvUZJC9d9oSqgQy9yMkrWMHEqefuyOmK9+P+4A22Pjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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