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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08b018f0d3ec5edbf50821ab7384e1c7af1b8072ca8a28e6f342d10cc9ea6dba' 
  AND token = 'Upy2+3fnv5avVdx1pacx5PZOs9QWpNi8zDQP9XzamFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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