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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae57e5aba675659763970c1585ffd113af4bc9b819e7bd34a198a1e9e72d9e4' 
  AND token = 'ZMRto7n7oufGeUZ0eCDdWPsdmgB1wL2hDw8pB+0MEvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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