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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57ed999498bbd1f5635b7b8bde4d4f36fdc6b20eac9db93e141e994db39eb1fd' 
  AND token = '/t08oMOsSHLg/X0CwzvglHLwAkbB1fnuSYFV0TTEFGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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