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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1222d7d250e5daa5b9b7f97cce94c5f4d6571f4222f23adb599ed4e8dea496c' 
  AND token = 'ffS/k7XLGKALs///Ar/y8omwhhjFTv3xqbT0wq49OYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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