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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4398e89bba35b3c32f690af0a7a913f2bd6b76f0a3f85a8bfce7abb84f0448d9' 
  AND token = 'CVNGo659gcO1QKscVEDyC4xes354nsq5JA3EkSLSA9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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