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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dfd275a7c729b61a96ec878b15ad28d2e21f47f85b0b9a377a26d1b98aa3775' 
  AND token = 'GmNoAVDfj2bk3CVmBNl8m8nqqlwsQZNZmjDrsRgZbzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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