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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af5bcf6c2355bc0c50d634efbf18a6174efa7ac785c698a544185583db82c17e' 
  AND token = 'Xu3bZ0wLMSbRxBIj95gxemf0+N5+Orx3zDW1BCHh634=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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