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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0824abf5c31ba85a9f81b49f8c0c80423020697144e277d9f4cbcb925e827dfb' 
  AND token = 'DohloFol0Qy6VVnwueOlGvsEe7d5ZKSG4SNoINQhwE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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