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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb945fdf64380f82ded94a952e477601044115e960b797a9467be47af7af39a4' 
  AND token = 'FLLebV8CRv0IaRVD/C57FQqZ0qhkgU71WOxq6CURCtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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