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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d4cf5f6a6c2f88d1bb9bf70144d2b3a748fff4071da13261ca0d2a91d9a5dd' 
  AND token = '3MULeGwSoUez+2D7NL0G6vkrox8R/N6xJvnzIuoxXOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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