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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a33ba1900522263e7b65c78d8360d0a67dfb514d9f01db6dcedbfd0bd82f9623' 
  AND token = 'vWf39b/rP6gm7dRS36xDGsB94r5UyDIfEpc+fMOTLMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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