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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '987142d0bda25f6dbf40fceb330aa5dddd71fc11d832cd3b58bdb799f7ef1e65' 
  AND token = '3oGi3gfCyq7ybnrkaSC4jC7XxkMzhYTxYmizRHc/VrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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