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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d9f8c355739d9a8c637acb141c93ddc26c83dd415eb3be59dd414091f5a06b' 
  AND token = 'k84HJ9iw83hrCsmk5wcO4amBPfXAE151QG5v7BhroJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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