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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '672e772f98ede959091d029dc8c1acbc1ec9ee95c0fa0f197eb02789be8bd7e3' 
  AND token = '8EEP6vBh/KKxluYgIpRwPzh3beRpJj5majrdrweC248=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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