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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '973b55800265df19a720c28dfab27ec86f4e8faaf4861c44115b36cee2c949dd' 
  AND token = 'GGIKr1vlttryT5ymZUAnXNLaEQnwHkOQ4s/WZkQT4us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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