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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9117e868b272892d8726acdc0d3635d94e5a9e7f02eff172e687ebcf11c0dc99' 
  AND token = 'Cxz9X1knnsk18CwvY+u5SYH1dkzFNfgfECOSwx8WQDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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