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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d5de5cd881ad1d41b1c2d0373e19ea5105ecc77047321cbe76036889404a96' 
  AND token = 'jb9lEspSh/7auwfAtJQpvbp9pZy3hsBr2WXm5gZ9L+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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