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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75dc3cd450af65bd724fb5e43be8271c31cae2817ad1f0d7dcb8fe24a32abe47' 
  AND token = 'MiBq05OfDWEg91geneP6/l0HXOHPjoGmqXJs1Pvq4B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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