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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76190b45d72771e09652865e0d74c169eb5042d5b4b1b3e4abb3796b549f626a' 
  AND token = '9u7MxZm5z2k/KTkafB2kxucE5l7AdooZ9DQoKe7Q81U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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