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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd272e28bd24859db2d0ffbea757a8d36063b635ad21c930590b280325fef1dbf' 
  AND token = 'vano0lZFsGPoPIQPH5mO9ciu+RWPED/UfaJfGvo5gZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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