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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f817ebc630023f0ba26e868904bd24b862868ee57fbedfb3d2e76e054c6a958' 
  AND token = 'myJRxKHepN8cI5FBlD8cmBdTwoisDoh/S5GdVdrAp74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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