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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f73605d14c4499963aecd48e58210dee3d96a9eb9222034ba6a60b279845d1' 
  AND token = '4NojC3Pals5BoS+REdbnKKetHJfMCpYqmrkxr/vqsNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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