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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d249d0c53ed034e0e1c6abb457e885b1f50b12a7cbb6a6c3aaa001a3dc3681' 
  AND token = 'lt4C1C4NhPnd+XlxkMCMxJ2eOM7HTJRMMr27OrU6GRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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