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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '842d967b83aa06c3137a3e0871d1eceaab7c40e2fc20d6e9a55afd384280ead1' 
  AND token = 'qjwVpBoK1kFIqbE0cZtzfaWYoer+v0hX7G6libDWYBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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