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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee3b01ae59e7c4f8eeffa17cbb9f2d60dbb4e66eaab5cd8c9a93c58d024cfe9' 
  AND token = 'cZiqpESOmLQQmnO3ocAwRKfqLlKuTJ/JshbwWj97SR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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