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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb2859969bc27947fface2f5dc706e7d167dd92b52b230283f2d551e509fe60' 
  AND token = 'm3MSfczaxLtK6dPt1EfNpjmvTjkTelssdfjGRJbGemc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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