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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad70d7eddf34b328c73f95961ba6378513b0f58fe3ed5a082fb31ebad93f5af' 
  AND token = 'pXfL/6fQEWcCe3wxEdDgxMxvP7/yLcMY7AiFh01wllE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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