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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd85aeeeab7e791403128223a0f64ef74f24b75e79582d5b34681278082cf618f' 
  AND token = 'wJrBpmsjXrYtMWqDZPHWxt6tE8O6hWOc8v1EwyCE7BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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