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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af2e5c48b7dd384968a754b2194ff6d2cdc983c35eadd694bb3c1eec3c921b6' 
  AND token = 'iZ6oFrnyVIZQcMzAr0G3GT98QnV39FISAaKu/6oRnac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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