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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7779232d2db1dd65c2c7b3867f6c3f89392f60229a174339bfbce9ccfd6e3376' 
  AND token = '+brrL5xpdfhM6WzkJrSU9PZGGMKsu9bFSNgeK6OKtbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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