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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5194c2b7939eeaf8550c6c8133ec8abae2cc92296f69bbe6a5c420db2eda1f9a' 
  AND token = '7otAcmHw3up5bOu0tcMYV7Xlzi4Eg5RCGZmus8LW3jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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