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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0258f9260ba72bd41ca8291fa53f3895a5a00db07d8a130245d8f566afeb85d' 
  AND token = 'TdpOjnNkIj++1M3Bgqt1QgdZWV195D8DxyMGlA1dJ5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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