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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '430ed92397f184a68ed4f30fb0c6b88424eb508c8ea48ead95d7a84ec3b0a967' 
  AND token = 'WdDiU8/oa9y8Ri7Is2O4DlIxuCR0xTU5NbrK97ApG9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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