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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad47e6d4b1319727732fbdf490c801111ecee85f72414e2e6bf31bae91cf3704' 
  AND token = '7DvZh+SmbkLv2ZtBz9I3FXjAOhCQaGnLXcI388ZN/Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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