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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b6a6f0f93c64aa16cb9cd651b492a888cdf428a2553b47ce2bcd37d0aa639a9' 
  AND token = 'Kgzet3qUv0lJqYDM0OKC8WOS0RlyRFPz54YRF8V6J4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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