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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92eb1d29ec099c80fc19e4585a14bf6967c6e0599eb866a8878349db42dc7cb2' 
  AND token = 'rbd0f/zlqmyJ0kvJzF0EB22BBWchZ99pEaNKxM5eriM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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