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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef52c6c0bca574ccfcaeeb4df7418b6fef045ca62aee554fa4595b82b70fde4c' 
  AND token = 'hVVJc+a0mRL1TYE3Bu5Vrhb+na/N6wvhrQtGjbepNBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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