SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32dc70b151fed4e8a3990010ba8d219bcb285bbc7f152fd99c70479f84897198' 
  AND token = 'o+AlBLQwdznT2uI7XZJh6pOZF0psKZp4Ug5SuvtuuZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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