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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b75229d8d6843d0b2cd913ad24942c68baf14bacfe291a5a2f2faf23b528288c' 
  AND token = '2PeJVdY4jq21Jo6Jx/KC1ZjxdGiHbe+GJZI6qB7WpPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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