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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64ac25401b45dadbd9711b75d42cfefc61c900e71a952f1a0e8a80e471111554' 
  AND token = 'lH2Mau9paw/NlwYH0TaCJBeO9Czb631+J2fuAuqgIQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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