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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf67b05143232ca6389780edffb37c4070129af868006fd3a69dd86c0f37974a' 
  AND token = 'kMYK2c/TmX9TSeD8Vy34rjd6IurdPTZucanD4i2+hjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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