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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fce08142e3696d04386f9d917ca2571660ce7a99c69b73694d1a49adc9f5141b' 
  AND token = 'cUbpy0iKCSN24t0j3xJTUs0MDmgbOjjiFgU4PTL68/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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