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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e5d13a4e24af3630501a648a79e14eb1b31438965a8a3dd2c470a1b323e4be' 
  AND token = 'KLfj14efKlTDAH7sB1WmAt/YP43012/Ax+gi9XZyJAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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