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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a4fdbf6c394cf94a0bcf5c554828dc8faea0c94d9510b979ac885af2681164a' 
  AND token = '1LjN1On5xnUX5+0ZdgsaJo21dKHm9YIw2pmcNndDebY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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