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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da9b042ab8ce7a8561465f6f5fb7538ecb42b76b66459b9e5a1200ac774b2446' 
  AND token = 'PduBXxhIBsovtfaP9FTDvn3plN+SyZSBBOqJZssaeRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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