SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0713339ed2f35fb522e3484fd9094b68bfceabe68c95f867cc6d1e623712fd33' 
  AND token = '1BR+qFeBr7gcQ3K/GHhe7Exn+n/jaWZfliYPpyiVSPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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