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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5e577b0b084ed1dae60b883c1c1a5968ceebeafd66db4d3e24f1b47f1c50b66' 
  AND token = 'uN7oFRugXNWQG+5DYdKDgOfRLqDE0/5qSbZphn5ARIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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