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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99c214d733c94190f096ea966a6576cecc349dd6a96bd2e97189a626e67a57af' 
  AND token = 'YrHqAIiOhPcwNioNbF3J+h9/1tWVAqbE47seTof6MbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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