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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '282a4cb35a7428f8d4481e30354f8b71a4df8bfe2dca7a1e3cbc89792e59db23' 
  AND token = 'EGPJLbAV+JXHKK34/tFbsJtv3nfGQCamDFuQW9pXsXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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