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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac4e49ffb57c32971aa1683ec1f6ee441d90bb1edb6acd0b9dcbf09963eaa842' 
  AND token = 'uue3FO6VmQ9q81i3Ytx6cCwD2azjx1P/fDeW0XfZ3iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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