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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4240be82ff339db312a7fd563ab231cc309ac27e248e3b451d8d1fd4e12a8a51' 
  AND token = 'hZKCJsXawK1Nf2B+jP7ebxGpN7ee/NbJ2g+AP07qyBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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