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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7bd07102867765045d8f837e4f2d282eb856232e72a671c5f090b77d4b3c8f6' 
  AND token = 'RqIEFfFP25A1dsyVOqoFQQq2zFMb4vzXKAVNTSwyj4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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