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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c11470cb9e1b8113ec9b95c27cd372aece2ce43d982da4425067b5ef51cc095f' 
  AND token = 'BYmToTramdpP3OqpqAeGPe1qqL0m6ENd3n4QfU7pLcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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