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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb99a21d78e36ff422d5197daa9b72e77e89a07bb3b61b9fa666ae119cb79ea' 
  AND token = 'A8uOws/Wm6Ejq7umv51wjngnkpAXFP//9EecbDgcEPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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