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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43117d42c14c1d89abe60a423447823a468bab7ec146c325e7d94b314272b7fb' 
  AND token = '04fN9yaSqxoIc97aB8p+CE4w55XXL9g+7ycNWgAbKJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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