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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e7e4ca2b5567b4914607eab7dec664e1719d0d9066821e5eb718b6ce97a9cab' 
  AND token = 'n2s1PmhkEnTxvN1FDV8amaV97teMulCu3W0N+HYGxMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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