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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d0d86ba0d884e885eaa682b49129b365c9fc20095762604503d097f522f4152' 
  AND token = 'sycGXmto/A1H3HAOu+NK/vHKEUWlDvYGrGn7o93A0nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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