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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d71304e0f1c6d9169284f351b9c5c8e578946ad925d7f0df70ba87639742614' 
  AND token = '4hH1f9CEhnk6apJam+vk4/Xn4m73VYOXJeYrq21qfhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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